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BEN # 171

Adolf Ceska aceska at CUE.BC.CA
Wed Jul 30 03:36:59 EST 1997


                                                   
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No. 171                              July 30, 1997

aceska at freenet.victoria.bc.ca        Victoria, B.C.
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 Dr. A. Ceska, P.O.Box 8546, Victoria, B.C. Canada V8W 3S2
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PACIFIC NORTHWEST CARNIVOROUS PLANT SHOW - AUGUST 10, 1997
From: david.wong at hortus.bc.ca

The  Pacific Northwest Carnivorous Plant Society (Canadian 
Chapter) 1997 Show and Sale

will take place on Sunday, August 10, 1997

     Richmond Nature Park (main pavilion)
     11851 Westminster Highway, Richmond B.C.
     (approx. 1/2 block west of No. 5 Road)

time: 11:00 am to 4:00 pm

admission: by donation

See different representatives of  the  many  carnivorous  plants
from  around  the  world  - including, Nepenthes from S.E. Asia,
Sarracenia from N. America, Pinguicula, Drosera from the tropics
to our backyard. Learn how to grow these plants.

For further info, please email: david.wong at hortus.bc.ca


FIELD KEY TO PIPERIA (ORCHIDACEAE) OF THE PACIFIC NORTHWEST
From: Randall Morgan, 3500 North Main Street, Soquel,
        California 95073

Two genera  of  rein-orchids  occur  in  the  Pacific  Northwest
(Piperia  Rydb.  and Platanthera L.C. Rich.), both of which have
been subsumed by some authors under the genus  Habenaria  Willd.
Plants  of  the genus Piperia can be distinguished from these in
Platanthera by the following characters: 1)  terrestrial  rather
than  semi-aquatic habitat; 2) stem leaves reduced to bracts; 3)
basal leaves usually withering before  or  during  anthesis;  4)
stem  arising from an ovoid tuber rather than fusiform roots; 5)
lip with median ridge rather than flat; 6) perianth  parts  one-
nerved;  7) anther cells opening laterally rather than apically;
8) flowers protandrous by movement of the lip.

Field key to Piperia of Oregon, Washington, British Columbia

1. Spur 2-6 mm, more or less shorter than lip

   2. Flowers white, blade of lip becoming curved  downward  and
      back toward spur
      ............................  P. candida Morgan & Ackerman

   2. Flowers  green  to  translucent,  blade of lip straight or
      curving slightly upward at tip
      .........................  P. unalascensis (Spreng.) Rydb.

1. Spur 7-15 mm, longer than lip

   3. Perianth green or partially  translucent;  viscidia  oval,
      not much longer than wide; plant generally tall, slender
      .......................................  P. elongata Rydb.

   3. Perianth  parts  white with green or yellow-green midvein,
      viscidia oblong, about  twice  as  long  as  wide;  plants
      robust to delicate

      4. Plants  relatively  delicate  (stem 1-3 mm diam.); spur
         straight, held horizontally;  lip  projecting  forward;
         floral fragrance clovelike, nocturnal
         ...............................  P. transversa Suksdorf

      4. Plants  relatively  robust (stem usually more than 3 mm
         diam.); spur usually more or less  curved,  often  held
         concealed  against  stem;  lip curving downward in age;
         floral fragrance often strong, but not clovelike
         ............................  P. elegans (Lindl.) Rydb. 
                              (syn.: P. maritima [Greene] Rydb.)

[Viscidium (pl. viscidia) - a sticky structure usually connected
   to the stipe that carry pollen masses,  thus  aiding  in  the
   attachment of the pollen to pollinators.]

Literature

Ackerman,  J.D.  1977. Biosystematics of the genus Piperia Rydb.
   Botanical Journal of the Linnean Society 75: 245-270.
Coleman, R.A. 1995. The  wild  orchids  of  California.  Cornell
   University Press, New York. 201 p.
Morgan,  R.  & J. Ackerman. 1990. Two new Piperias (Orchidaceae)
   from western North America. Lindleyana 5(4): 205-211.
Morgan, R. & L. Glicenstein. 1993. Additional California taxa in
   Piperia (Orchidaceae). Lindleyana 8: 89-95.


NEW SPECIES FOR BRITISH COLUMBIA: CLARKIA VIMINEA (ONAGRACEAE)
From: Adolf & Oluna Ceska <aceska at freenet.victoria.bc.ca>

On July 20, 1997 we found a population of  about  50  plants  of
Clarkia  viminea in Mt. Tzuhalem Ecological Reserve, near Duncan
on Vancouver Island (AC 31,134). The plants  grew  with  Clarkia
amoena  susbp. lindleyi on the warmest grassy slope dominated by
Stipa lemmonii.

Clarkia viminea (Dougl. ex Hook.) A. Nels.  &  J.F.  Macbr.  has
been recently treated as a subspecies of C. purpurea (W. Curtis)
A.  Nels. & J.F. Macbr. (subsp. viminea [Dougl. ex Hook.] H.F. &
M.E. Lewis). The plants are erect either simple  or  with  erect
branches,  slightly puberulent. The leaves are linear to lanceo-
late with short petioles or sessile. Flower buds are  erect  and
flowers are sessile with reflexed sepals and purplish or crimson
petals.



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